Oven Care

Drying & Curing Your Clay Oven

A technical guide to drying, curing and firing your Brasa wood-fired oven for the best performance. Applies to all Brasa models · temperatures in °F and °C.

Download the guide (PDF)

Objective

This guide describes the recommended procedure for drying and starting up a new Brasa clay oven, or one that has been out of use, in order to remove internal moisture, properly cure its materials, and optimize its performance.

Before You Begin

  • •Before lighting the oven, make sure it is completely dry and free of moisture.
  • •If the oven has been out of use for 10–15 days, carry out a gradual drying process before operating at high temperatures.
  • •If the oven is installed outdoors, fit the chimney with a suitable flue pipe and rain cap.
  • •Use only dry, small-sized hardwood (see “Recommended Firewood”).
  • •Monitor the temperature with a thermometer during each cycle.

Recommended Firewood

Use well-seasoned hardwoods: air-dry them for 6 to 12 months, until moisture content is below 20%. These options are easy to find in the United States and Puerto Rico.

WoodWhere to find itCharacteristics
OakThroughout the U.S.Intense, long-lasting heat. The most versatile choice, and a relative of holm oak.
HickoryEastern & southern U.S.Very dense; high heat and a strong smoky flavor.
Hard mapleNorthern & eastern U.S.Steady flame and mild flavor.
AshThroughout the U.S.Lights easily and produces little smoke.
Pecan & mesquiteSouthern & southwestern U.S.Pecan: mild flavor. Mesquite: very hot; best mixed with another wood.
Fruitwoods: apple, cherryThroughout the U.S.Sweet, mild aroma; ideal for pizza, bread and meats.
GuavaPuerto RicoHighly valued fruitwood; sweet aroma.
Citrus: orange, lemon, grapefruitPuerto RicoReadily available from pruning; pleasant aroma.
Úcar (black olive)Puerto RicoVery dense wood; long-lasting embers.
Tamarind & algarroboPuerto RicoHardwoods with good heat output.

Woods to Avoid

  • •Softwoods or resinous woods (pine, cypress, cedar) — heavy smoke and soot (creosote).
  • •Treated, painted or varnished wood, plywood, pallets and construction scraps — they release toxic substances.
  • •Toxic plants such as manchineel (common along Puerto Rico's coasts) or oleander — their smoke is toxic.
  • •Green, damp or moldy wood — it smokes, soils the dome and produces little heat.

Initial Drying Process

Carry out the following heating cycles progressively. During drying, keep the door and the chimney damper fully open to allow moisture to escape.

CycleWhenTemperatureDuration
1Day 1176–212°F (80–100°C)3–4 h
2Day 2 (or a few days later)176–212°F (80–100°C)3–4 h
3Next cycle302–392°F (150–200°C)3–4 h
4Next cycle482–572°F (250–300°C)2.5–3 h
5Final curing788–896°F (420–480°C)30–45 min

°C values are the equivalents of the temperatures shown in °F.

Why is this necessary?

Gradual heating allows the oven's internal insulation to cure properly. The insulating materials absorb heat, contract slightly, and become harder and more stable.

Hairline cracks & fissures

Small fissures may appear around the flue, the door, or the dome. These are a natural part of curing — after several uses they may open slightly, then seal on their own.

Firing for Full Performance

Once the initial drying is complete, follow this procedure each time you fire the oven. At the start, keep the chimney damper and the door air-intake regulator open.

StepActionTemperature
1Load 4–6 small, dry sticks or branches and light them.—
2About 5 minutes after the flame catches, add 3–4 more sticks. If more combustion is needed, open the door slightly to increase the draft.—
3At 15 minutes, add 2–3 more sticks.≈ 572°F (300°C)
4Keep feeding the fire until it reaches the target temperature, and hold it for 20–30 minutes to heat the clay insulation.824–860°F (440–460°C)
5When the flame dies out, the dome turns white and the temperature drops. Remove the embers, leaving a couple of handfuls inside to retain heat longer.392–464°F (200–240°C)
6Close the chimney damper to 80% and close the door air-intake regulator. The oven is ready for cooking.—

During the first few uses, the oven performs below its full capacity. Performance improves progressively: it will reach temperature faster and use less firewood over time.

Summary

  • •Verify that the oven is completely dry.
  • •Use dry, small-sized hardwood; avoid resinous, treated or toxic woods.
  • •Keep the door and chimney damper open during drying.
  • •Increase the temperature progressively.
  • •Finish with a cycle at 788–896°F (420–480°C) for 30–45 minutes.
  • •For each firing, bring the oven to 824–860°F (440–460°C) for 20–30 minutes, then close the damper to 80% and close the air regulator.
  • •Expect lower performance during the first few uses; it improves progressively.
  • •Consider small initial fissures caused by insulation curing to be normal.

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